Specifies the amount of time for Automatic Updates to wait following system startup before proceeding with a scheduled installation that was missed previously.If the status is set to Enabled a scheduled installation that did not take place earlier will occur the specified number of minutes after the computer is next started.If the status is set to Disabled a missed scheduled installation will occur with the next scheduled installation.If the status is set to Not Configured a missed scheduled installation will occur one minute after the computer is next started.Note: This policy applies only when Automatic Updates is configured to perform scheduled installations of updates. If the "Configure Automatic Updates" policy is disabled this policy has no effect.
Windows Components\Windows Update
Machine
Windows 7 Windows Server 2008 R2 Windows Vista Windows Server 2003 Windows XP SP2 Windows XP SP1 Windows 2000 SP4 Windows 2000 SP3
HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate\AU!RescheduleWaitTimeEnabled; HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate\AU!RescheduleWaitTime
WindowsUpdate.admx